[{"id":3674854,"web_url":"http://patchwork.ozlabs.org/comment/3674854/","msgid":"<20260408162846.GE3357077@nvidia.com>","list_archive_url":null,"date":"2026-04-08T16:28:46","subject":"Re: [PATCH] iommu: Ensure .iotlb_sync is called correctly","submitter":{"id":79424,"url":"http://patchwork.ozlabs.org/api/people/79424/","name":"Jason Gunthorpe","email":"jgg@nvidia.com"},"content":"On Wed, Apr 08, 2026 at 03:40:57PM +0100, Robin Murphy wrote:\n> Many drivers have no reason to use the iotlb_gather mechanism, but do\n> still depend on .iotlb_sync being called to properly complete an unmap.\n> Since the core code is now relying on the gather to detect when there\n> is legitimately something to sync, it should also take care of encoding\n> a successful unmap when the driver does not touch the gather itself.\n> \n> Fixes: 90c5def10bea (\"iommu: Do not call drivers for empty gathers\")\n> Reported-by: Jon Hunter \n> Closes: https://lore.kernel.org/r/8800a38b-8515-4bbe-af15-0dae81274bf7@nvidia.com\n> Signed-off-by: Robin Murphy \n> ---\n> drivers/iommu/iommu.c | 6 ++++++\n> 1 file changed, 6 insertions(+)\n\nReviewed-by: Jason Gunthorpe \n\nJason","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-tegra@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256\n header.s=selector2 header.b=onrITpeZ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-tegra+bounces-13613-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com\n 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linux@armlinux.org.uk,\n\tiommu@lists.linux.dev, linux-tegra@vger.kernel.org,\n\tJon Hunter ","Subject":"Re: [PATCH] iommu: Ensure .iotlb_sync is called correctly","Message-ID":"<20260408162846.GE3357077@nvidia.com>","References":"\n <8982e3412563cf91e106d59228dfb6115024c75e.1775659257.git.robin.murphy@arm.com>","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"\n <8982e3412563cf91e106d59228dfb6115024c75e.1775659257.git.robin.murphy@arm.com>","X-ClientProxiedBy":"BL1PR13CA0406.namprd13.prod.outlook.com\n (2603:10b6:208:2c2::21) To LV8PR12MB9620.namprd12.prod.outlook.com\n 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Many drivers have no reason to use the iotlb_gather mechanism, but do\n> still depend on .iotlb_sync being called to properly complete an unmap.\n> Since the core code is now relying on the gather to detect when there\n> is legitimately something to sync, it should also take care of encoding\n> a successful unmap when the driver does not touch the gather itself.\n> \n> Fixes: 90c5def10bea (\"iommu: Do not call drivers for empty gathers\")\n> Reported-by: Jon Hunter \n> Closes: https://lore.kernel.org/r/8800a38b-8515-4bbe-af15-0dae81274bf7@nvidia.com\n> Signed-off-by: Robin Murphy \n> ---\n> drivers/iommu/iommu.c | 6 ++++++\n> 1 file changed, 6 insertions(+)\n> \n> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c\n> index 50718ab810a4..ee83850c7060 100644\n> --- a/drivers/iommu/iommu.c\n> +++ b/drivers/iommu/iommu.c\n> @@ -2717,6 +2717,12 @@ static size_t __iommu_unmap(struct iommu_domain *domain,\n> \n> \t\tpr_debug(\"unmapped: iova 0x%lx size 0x%zx\\n\",\n> \t\t\t iova, unmapped_page);\n> +\t\t/*\n> +\t\t * If the driver itself isn't using the gather, make sure\n> +\t\t * it looks non-empty so iotlb_sync will still be called.\n> +\t\t */\n> +\t\tif (iotlb_gather->start >= iotlb_gather->end)\n> +\t\t\tiommu_iotlb_gather_add_range(iotlb_gather, iova, size);\n> \n> \t\tiova += unmapped_page;\n> \t\tunmapped += unmapped_page;\n\n\nTested-by: Jon Hunter \n\nThanks!\nJon","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-tegra@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256\n header.s=selector2 header.b=lzwVLtkb;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.232.135.74; helo=sto.lore.kernel.org;\n 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Apr 08, 2026 at 06:28:55PM +0100, Jon Hunter wrote:\n> \n> On 08/04/2026 15:40, Robin Murphy wrote:\n> > Many drivers have no reason to use the iotlb_gather mechanism, but do\n> > still depend on .iotlb_sync being called to properly complete an unmap.\n> > Since the core code is now relying on the gather to detect when there\n> > is legitimately something to sync, it should also take care of encoding\n> > a successful unmap when the driver does not touch the gather itself.\n> > \n> > Fixes: 90c5def10bea (\"iommu: Do not call drivers for empty gathers\")\n> > Reported-by: Jon Hunter \n> > Closes: https://lore.kernel.org/r/8800a38b-8515-4bbe-af15-0dae81274bf7@nvidia.com\n> > Signed-off-by: Robin Murphy \n> > ---\n> > drivers/iommu/iommu.c | 6 ++++++\n> > 1 file changed, 6 insertions(+)\n> > \n> > diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c\n> > index 50718ab810a4..ee83850c7060 100644\n> > --- a/drivers/iommu/iommu.c\n> > +++ b/drivers/iommu/iommu.c\n> > @@ -2717,6 +2717,12 @@ static size_t __iommu_unmap(struct iommu_domain *domain,\n> > \t\tpr_debug(\"unmapped: iova 0x%lx size 0x%zx\\n\",\n> > \t\t\t iova, unmapped_page);\n> > +\t\t/*\n> > +\t\t * If the driver itself isn't using the gather, make sure\n> > +\t\t * it looks non-empty so iotlb_sync will still be called.\n> > +\t\t */\n> > +\t\tif (iotlb_gather->start >= iotlb_gather->end)\n> > +\t\t\tiommu_iotlb_gather_add_range(iotlb_gather, iova, size);\n> > \t\tiova += unmapped_page;\n> > \t\tunmapped += unmapped_page;\n> \n> \n> Tested-by: Jon Hunter \n\nTested-by: Russell King (Oracle) \n\nI think the commit message needs to spell out that the blamed commit\ncauses random memory corruption which leads to data corruption and\nkernel oopses.\n\nThanks!","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-tegra@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature 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b=qFu40S34x3LPTlvHlJxgPpP1VE\n\t5lcrapFLgKvUE5BdnKOsWZgZqznw3hd7hv/+YTmZLtc7DK0lveb5mHqcKDjVlYJSu7/D8mi2ul7E+\n\tLts+VGGD58x68+/ZE/xIWfP+d/MA16VoVwOvK8V/yrGjzdqVJOcO97zbX1rWd/NvHYZjKqfc0CkmY\n\tM8GrxwLH4sLTBU1TG0kfa37TDUJQxDPwGAy/gIWFAAY3Jj2oTtV4fXrcmJB3mzLXLlj0QWHRH8nfG\n\tQj+cI5ctSa0AxCeMYOR7WyYSJS8eN+JDqUPhYrL/oSRnRreXppPbmQ0iRDehJwNeh4i6tn41QZG8P\n\tS7PklMcg==;","Date":"Wed, 8 Apr 2026 20:55:18 +0100","From":"\"Russell King (Oracle)\" ","To":"Jon Hunter ","Cc":"Robin Murphy , joro@8bytes.org, will@kernel.org,\n\tjgg@nvidia.com, iommu@lists.linux.dev, linux-tegra@vger.kernel.org","Subject":"Re: [PATCH] iommu: Ensure .iotlb_sync is called correctly","Message-ID":"","References":"\n <8982e3412563cf91e106d59228dfb6115024c75e.1775659257.git.robin.murphy@arm.com>\n ","Precedence":"bulk","X-Mailing-List":"linux-tegra@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"","Sender":"Russell King (Oracle) "}},{"id":3675307,"web_url":"http://patchwork.ozlabs.org/comment/3675307/","msgid":"<177573643352.3408469.5575202206607092720.b4-ty@kernel.org>","list_archive_url":null,"date":"2026-04-09T13:01:18","subject":"Re: [PATCH] iommu: Ensure .iotlb_sync is called correctly","submitter":{"id":76918,"url":"http://patchwork.ozlabs.org/api/people/76918/","name":"Will Deacon","email":"will@kernel.org"},"content":"On Wed, 08 Apr 2026 15:40:57 +0100, Robin Murphy wrote:\n> Many drivers have no reason to use the iotlb_gather mechanism, but do\n> still depend on .iotlb_sync being called to properly complete an unmap.\n> Since the core code is now relying on the gather to detect when there\n> is legitimately something to sync, it should also take care of encoding\n> a successful unmap when the driver does not touch the gather itself.\n> \n> \n> [...]\n\nApplied to iommu (fixes), thanks!\n\n[1/1] iommu: Ensure .iotlb_sync is called correctly\n https://git.kernel.org/iommu/c/7e0548525abd\n\nCheers,","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-tegra@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=oj9lkDOg;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c15:e001:75::12fc:5321; helo=sin.lore.kernel.org;\n envelope-from=linux-tegra+bounces-13645-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=\"oj9lkDOg\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=10.30.226.201"],"Received":["from sin.lore.kernel.org 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(Postfix) with ESMTPSA id 7A923C4CEF7;\n\tThu, 9 Apr 2026 13:01:33 +0000 (UTC)"],"ARC-Seal":"i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1775739699; cv=none;\n b=qeHgpV6opLsGUm2ljmMiZ/i6uSJ2CZRIQyDQ53txGSveCx714//wLJ9VGlJpW+v1rqwI+VwmE04kyxWGNanVW3HrP9WL0eJnwwACuxZlmTQOXH4Z5CPILfcTVqjJT98VFY3B26lRevfAMKojadpz+vfBJxIX2X1XeGoQKKGbNoY=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1775739699; c=relaxed/simple;\n\tbh=ErkqhB3XTMjrXF4/gzU2lN8NYsLR+G/xAykedOQYTWQ=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version:Content-Type;\n b=XNB1dldEmbuNXnOYagHWCtzZT91fyZ9zIt5/ccrxJjkmT6hbQOFlkJ8ZfWziACcaA4mXOl+m5qCTdW8LHsI4k+aFKLbQNAXj+7rukKPZ8SFwHsC8+CkEEZBSb2csXYz9lUDFVKJsqB4N2FpYcq8WMdGjvktrnSOJb1encsoxij4=","ARC-Authentication-Results":"i=1; smtp.subspace.kernel.org;\n dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=oj9lkDOg; arc=none smtp.client-ip=10.30.226.201","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1775739698;\n\tbh=ErkqhB3XTMjrXF4/gzU2lN8NYsLR+G/xAykedOQYTWQ=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=oj9lkDOggpSM+xgiDGOL6MqaD8/1lWr2YS8pZKVJ1zkE/btZcxKND9Jf8EnMcnl8P\n\t UdnB9dxBSUahU1bFvvYEo6UxXzyrQEGbq+6f57whWhaPFI0OON4+ptSzB9c6+mMQig\n\t NG0Ljdxnm8MQ7aGq6PuRy3GJjmKpULO1N1bE2pkef6UzYM/vS/qXRRYrO46R05XImu\n\t lT/gjPwDKB1KhMcv81FVtkzpWCOrVgS8CRuYqhsQOsTMy8zRzz0C+qX946kf+LC7hW\n\t b/KNbLWRQtv9/X8XHDVt2iAng2F8dS3QJKdJaApO7iV9MzLppJ5nqqbfSDNujOIalU\n\t IdDcpph9uA6Dw==","From":"Will Deacon ","To":"joro@8bytes.org,\n\tRobin Murphy ","Cc":"catalin.marinas@arm.com,\n\tkernel-team@android.com,\n\tWill Deacon ,\n\tlinux@armlinux.org.uk,\n\tiommu@lists.linux.dev,\n\tlinux-tegra@vger.kernel.org,\n\tJon Hunter ,\n\tJason Gunthorpe ","Subject":"Re: [PATCH] iommu: Ensure .iotlb_sync is called correctly","Date":"Thu, 9 Apr 2026 14:01:18 +0100","Message-ID":"<177573643352.3408469.5575202206607092720.b4-ty@kernel.org>","X-Mailer":"git-send-email 2.47.3","In-Reply-To":"\n <8982e3412563cf91e106d59228dfb6115024c75e.1775659257.git.robin.murphy@arm.com>","References":"\n <8982e3412563cf91e106d59228dfb6115024c75e.1775659257.git.robin.murphy@arm.com>","Precedence":"bulk","X-Mailing-List":"linux-tegra@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"8bit"}}]